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authorEric Miao <eric.miao@marvell.com>2009-02-03 22:52:40 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2009-03-24 19:38:24 -0400
commit57fee4a58fe802272742caae248872c392a60670 (patch)
treea3cd02fb3c1decb829c520d1a5319bef0ce7bd27 /drivers/base/platform.c
parent71b3e0c1ad90f28e34c105069175cbd4edb43dfa (diff)
platform: introduce module id table for platform devices
Now platform_device is being widely used on SoC processors where the peripherals are attached to the system bus, which is simple enough. However, silicon IPs for these SoCs are usually shared heavily across a family of processors, even products from different companies. This makes the original simple driver name based matching insufficient, or simply not straight-forward. Introduce a module id table for platform devices, and makes it clear that a platform driver is able to support some shared IP and handle slight differences across different platforms (by 'driver_data'). Module alias is handled automatically when a MODULE_DEVICE_TABLE() is defined. To not disturb the current platform drivers too much, the matched id entry is recorded and can be retrieved by platform_get_device_id(). Signed-off-by: Eric Miao <eric.miao@marvell.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base/platform.c')
-rw-r--r--drivers/base/platform.c23
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 62a8768d96b3..ec993aa6a2ca 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -584,10 +584,25 @@ static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
584{ 584{
585 struct platform_device *pdev = to_platform_device(dev); 585 struct platform_device *pdev = to_platform_device(dev);
586 586
587 add_uevent_var(env, "MODALIAS=platform:%s", pdev->name); 587 add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
588 (pdev->id_entry) ? pdev->id_entry->name : pdev->name);
588 return 0; 589 return 0;
589} 590}
590 591
592static const struct platform_device_id *platform_match_id(
593 struct platform_device_id *id,
594 struct platform_device *pdev)
595{
596 while (id->name[0]) {
597 if (strcmp(pdev->name, id->name) == 0) {
598 pdev->id_entry = id;
599 return id;
600 }
601 id++;
602 }
603 return NULL;
604}
605
591/** 606/**
592 * platform_match - bind platform device to platform driver. 607 * platform_match - bind platform device to platform driver.
593 * @dev: device. 608 * @dev: device.
@@ -604,7 +619,13 @@ static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
604static int platform_match(struct device *dev, struct device_driver *drv) 619static int platform_match(struct device *dev, struct device_driver *drv)
605{ 620{
606 struct platform_device *pdev = to_platform_device(dev); 621 struct platform_device *pdev = to_platform_device(dev);
622 struct platform_driver *pdrv = to_platform_driver(drv);
623
624 /* match against the id table first */
625 if (pdrv->id_table)
626 return platform_match_id(pdrv->id_table, pdev) != NULL;
607 627
628 /* fall-back to driver name match */
608 return (strcmp(pdev->name, drv->name) == 0); 629 return (strcmp(pdev->name, drv->name) == 0);
609} 630}
610 631